diff --git a/Source/Core/Common/StringUtil.cpp b/Source/Core/Common/StringUtil.cpp
index bea9ac5d9d9..79dc2a42696 100644
--- a/Source/Core/Common/StringUtil.cpp
+++ b/Source/Core/Common/StringUtil.cpp
@@ -16,7 +16,6 @@
 #include <locale>
 #include <sstream>
 #include <string>
-#include <type_traits>
 #include <vector>
 
 #include <fmt/format.h>
@@ -365,17 +364,6 @@ std::vector<std::string> SplitString(const std::string& str, const char delim)
   return output;
 }
 
-std::string TabsToSpaces(int tab_size, std::string str)
-{
-  const std::string spaces(tab_size, ' ');
-
-  size_t i = 0;
-  while (str.npos != (i = str.find('\t')))
-    str.replace(i, 1, spaces);
-
-  return str;
-}
-
 std::string ReplaceAll(std::string result, std::string_view src, std::string_view dest)
 {
   size_t pos = 0;
diff --git a/Source/Core/Common/StringUtil.h b/Source/Core/Common/StringUtil.h
index c635155d5b0..2351c3f7206 100644
--- a/Source/Core/Common/StringUtil.h
+++ b/Source/Core/Common/StringUtil.h
@@ -180,8 +180,6 @@ std::from_chars_result FromChars(std::string_view sv, std::floating_point auto&
 }
 }  // namespace Common
 
-std::string TabsToSpaces(int tab_size, std::string str);
-
 std::vector<std::string> SplitString(const std::string& str, char delim);
 
 // "C:/Windows/winhelp.exe" to "C:/Windows/", "winhelp", ".exe"